Hi,
Replying to my own post.
Found that there is a tls_config pointer which needs to be filled in
the struct mqtt_connect_client_info_t
So, I did:
mqtt_client_info.tls_config =
altcp_tls_create_config_client(test_ca_crt, test_ca_crt_len);
Which gave me this warning:
altcp_tls: TCP_WND is smaller than the RX decryption buffer,
connection RX might stall!
Which states TCP_WND to be bigger than:
#define MBEDTLS_SSL_MAX_CONTENT_LEN 16384 /**< Size of the
input / output buffer */
So I did change in lwipopts.h
#define TCP_WND (12*TCP_MSS) // was 2
But now, I get an error directive at build time:
D:\Work\LWIP\lwip-2.1.2\src\core\init.c(318): error: #35: #error
directive: "lwip_sanity_check: WARNING: TCP_WND is larger than space
provided by PBUF_POOL_SIZE * (PBUF_POOL_BUFSIZE - protocol headers).
If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS
to 1 to disable this error."
#error "lwip_sanity_check: WARNING: TCP_WND is larger than space
provided by PBUF_POOL_SIZE * (PBUF_POOL_BUFSIZE - protocol headers).
If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS
to 1 to disable this error."
So, What should be done ?
Am I going on the right track, or something is wrong somewhere ?
Thanks,
Manu
On Fri, Aug 21, 2020 at 12:03 AM Manu Abraham <abraham.m...@gmail.com> wrote:
>
> Hi,
>
> I have been trying to use mqtt from lwip-2.1.2 alongwith mqtt and mbedtls.
> Trying to connect to a running mosquitto on a PC (192.168.1.34)
>
> I see that mqtt uses alttcp as a wrapper, which connects to mbedtls,
> which uses lwip_tcp
>
> But, looking at
>
> void
> mqtt_example_init(void)
> {
> #if LWIP_TCP
> mqtt_client = mqtt_client_new();
>
> mqtt_set_inpub_callback(mqtt_client,
> mqtt_incoming_publish_cb,
> mqtt_incoming_data_cb,
> LWIP_CONST_CAST(void*, &mqtt_client_info));
>
> mqtt_client_connect(mqtt_client,
> &mqtt_ip, MQTT_PORT,
> mqtt_connection_cb, LWIP_CONST_CAST(void*, &mqtt_client_info),
> &mqtt_client_info);
> #endif /* LWIP_TCP */
> }
>
> from contrib/mqtt_example.c, it gets connected over tcp.
> Trying to connect using tcp, I get the following debug trace
>
> IPv4 Address : 192.168.1.33
> IPv4 Subnet mask : 255.255.255.0
> IPv4 Gateway : 192.168.1.1
>
> Lease period: 86400s, Renew in: 43200s, Rebind in: 75600s
>
> (1150) mqtt_example_init: Initializing MQTT client
> (1161) mqtt_example_init: Connecting to MQTT Broker:192.168.1.34:8883
> tcp_bind: bind to port 52032
> mqtt_client_connect: Connecting to host: 192.168.1.34 at port:8883
> tcp_connect to port 8883
> mqtt_tcp_connect_cb: TCP connection established to server
> mqtt_output_send: tcp_sndbuf: 5840 bytes, ringbuf_linear_available:
> 18, get 0, put 18
> mqtt_tcp_err_cb: TCP error callback: error -14, arg: 30044044
> MQTT client "test" connection cb: status 256
> tcp_pcb_purge
> tcp_pcb_purge: data left on ->unacked
> tcp_slowtmr: no active pcbs
> (109) print_dhcp_state: Test MQTT publish
> Assertion "mqtt_publish: TCP disconnected" failed at line 1110 in
> D:\Work\LWIP\lwip-2.1.2\src\apps\mqtt\mqtt.c
> (1219) publish_data: Publish err: -11
>
>
>
> So, how should one connect MQTT when using mbedtls ?
>
> Can someone help ?
>
> Thanks,
>
> Manu
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